javax.activation.FileDataSource Maven / Gradle / Ivy
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/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*/
/*
* @(#)FileDataSource.java 1.9 05/11/16
*
* Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
*/
package javax.activation;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import com.sun.activation.registries.MimeTypeFile;
/**
* The FileDataSource class implements a simple DataSource object
* that encapsulates a file. It provides data typing services via
* a FileTypeMap object.
*
* FileDataSource Typing Semantics
*
* The FileDataSource class delegates data typing of files
* to an object subclassed from the FileTypeMap class.
* The setFileTypeMap method can be used to explicitly
* set the FileTypeMap for an instance of FileDataSource. If no
* FileTypeMap is set, the FileDataSource will call the FileTypeMap's
* getDefaultFileTypeMap method to get the System's default FileTypeMap.
*
* @see javax.activation.DataSource
* @see javax.activation.FileTypeMap
* @see javax.activation.MimetypesFileTypeMap
*/
public class FileDataSource implements DataSource {
// keep track of original 'ref' passed in, non-null
// one indicated which was passed in:
private File _file = null;
private FileTypeMap typeMap = null;
/**
* Creates a FileDataSource from a File object. Note:
* The file will not actually be opened until a method is
* called that requires the file to be opened.
*
* @param file the file
*/
public FileDataSource(File file) {
_file = file; // save the file Object...
}
/**
* Creates a FileDataSource from
* the specified path name. Note:
* The file will not actually be opened until a method is
* called that requires the file to be opened.
*
* @param name the system-dependent file name.
*/
public FileDataSource(String name) {
this(new File(name)); // use the file constructor
}
/**
* This method will return an InputStream representing the
* the data and will throw an IOException if it can
* not do so. This method will return a new
* instance of InputStream with each invocation.
*
* @return an InputStream
*/
public InputStream getInputStream() throws IOException {
return new FileInputStream(_file);
}
/**
* This method will return an OutputStream representing the
* the data and will throw an IOException if it can
* not do so. This method will return a new instance of
* OutputStream with each invocation.
*
* @return an OutputStream
*/
public OutputStream getOutputStream() throws IOException {
return new FileOutputStream(_file);
}
/**
* This method returns the MIME type of the data in the form of a
* string. This method uses the currently installed FileTypeMap. If
* there is no FileTypeMap explictly set, the FileDataSource will
* call the getDefaultFileTypeMap method on
* FileTypeMap to acquire a default FileTypeMap. Note: By
* default, the FileTypeMap used will be a MimetypesFileTypeMap.
*
* @return the MIME Type
* @see javax.activation.FileTypeMap#getDefaultFileTypeMap
*/
public String getContentType() {
// check to see if the type map is null?
if (typeMap == null)
return FileTypeMap.getDefaultFileTypeMap().getContentType(_file);
else
return typeMap.getContentType(_file);
}
/**
* Return the name of this object. The FileDataSource
* will return the file name of the object.
*
* @return the name of the object.
* @see javax.activation.DataSource
*/
public String getName() {
return _file.getName();
}
/**
* Return the File object that corresponds to this FileDataSource.
* @return the File object for the file represented by this object.
*/
public File getFile() {
return _file;
}
/**
* Set the FileTypeMap to use with this FileDataSource
*
* @param map The FileTypeMap for this object.
*/
public void setFileTypeMap(FileTypeMap map) {
typeMap = map;
}
}